Band topologies of hexaborides CaB6 and EuB6

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2017,（1）
• 页码范围: 76-79
• 页数: 4页
• 语种: 中文
• DOI: 10.1007/s11433-016-0382-3

摘要

In last decades,topological materials [1-3] have attracted lots of research interest.Topological Kondo insulator (TKI) [4],as an exotic quantum state,has been proposed theoretically in two hexaborides SmB6 and YbB6,in which there is a d/f(p) band inversion at momentum point X [5].There are lots of experimental work supporting the TKI state and metallic surface state in typical Kondo insulator SmB6 [6-10].However,more and more experimental results demonstrated that YbB6 is trivial insulator at ambient pressure [11].Under high pressure,the band gap of YbB6 will close and the d/p band inversion can happen under pressure about 15 GPa [12].